Rotary grinding-machine.



WiLLrni/r eownn; for JoHANN'EsnURG, rnANsvnAL.

:ecran-Y 'Gallimard-MACHINE.

Specification of netten iig-@elim I ratei zollgp To all vwhom t mayconcern.-

Be it known that l, WILLIAM. GoWAN,

asubject ofthe King'of-Great Britain, and.

resident of' lJohannesburg, Province of Transvaal, Union of SouthAfrica, 4have inlvented cert-am nen1 and .useful Improve-A ments inRotary.` Grinding-Machines, of which the following is a specication.l v

This invention has reference torotary grinding machines and moreespecially to that type: in which a tubular or like shellor barrelreceives the grinding charge and has a rotatory motion imparted to it.

The object vof my invention is to` improve the yeiiciency of grindingmachines of this kind, and to that end consists essentially in iconstructing the tubular or like shell or bar'- rel "of oval orelliptical shape in cross-section preferably With one end smaller thanthe 'other and with the major axis ofthe smaller en d at right angles tothe major axis of the larger end. The longitudinal taper of the shell orbarrel portion of the machine is in the -direction of the delivery oroutlet end..

The invention will be more 'fully described by aid of the accompanyingdrawing Whereii1 Figure l represents the machine in 'longitudinalsection, Fig. 2 being a plan' of the machine. Fig. 3 is a section ofFig.- 1 on line :1a-fw, and Fig. 4F is a section of Fig. 1

1 is the shell or barrel of my improved rotary Grinding machine, and 2the lining here or.l The shell or barrel 1 as shown see moreparticularly Ffgs' and Z1--isof oval or elliptical shap n cross-section,the

major axis of the ellipse representing the larger and inlet end thereofbeing at right 40.

angles to the major axis of the ellipse rep;

.resenting the smaller and outlet -end of the same as shownmorevparticularly in Fig. 3;

larger end of theshell or barrel 1. j

3, 4 represent the covers or end plates for the barrel or shell 1 towhich they are fixed by the L pieces 5, 6, and 7, 8 represent the vlining plates `for said covers 3, 4.

9, 10 are the trunnions'on the covers" or end plates 3, 4:, by which theshell br barrel v 1 is revolublysupported in the bearings 11,

12, which latter are'carried on suitable supports or foundations 13,14.The opening 15 through the trunnion 9 constitutQS the in- `let into themachine and throughit the :charge of grinding material and the materialto be" ground are introduced into Application led January 23, 1 912. YSerial N; 672,957.Y

parts. I 18 lis-an aperture closed by-a Winfbolt -19 i 16l is a feedhopper which `projects into.y the-l1ollow-trunni-on 9,'and 17 isaglandand s tuiiin'gbox for making a jointzbetweensad for removing .anyobstruction in the hopper 16.01- opening 15 or for cleaningout thesame--when'desiredl Said inlet 18 may be used for introducingthe pulp orliquid ccnveying't-he material to.be ground if such material isintroduced into" the mill inthat form'. .lnpthat case the 'hopper -16vwill be used as the means for introducing the pebbles. fragmentary, rockor other grinding material.'

20,21 'are' toothed wheels v'fixedamn-ld the.;

larger and smaller ends 0f the shellor barrel ,1 for imparting rotatorymotion thereto,-

and 22, 23 are rings or rails fixed around the shell or barrel l nearthe ends, which rings or rails run' on rollers 24,25'l which therebyrevolubly support the barrel or shell 1.

26 is the outlet or delivery pipe for the ground' product. It is'located at the smaller end of the shell or barrel 1, and

asshovvn in Figs. 1 and 3.- At its upper end insider the shell, orbarrel 1 the pipe 26 is ttedwith a launder or box 27 in which theoutflowing pulp is received and from which it enters said pipe 26. Thepipe 26 projects through the hollow trunnion 10.

a joint between the pipe 26 and the trunnion 1 28 is a glandand'stuiln'g box for making- -projects to ,a suitable vheight inside thesame.

The pipe 26 at the outside-of the trun'nion may be bent upward to aheight not exceed ing the launder orbcx 27 so as to obtain a fall'ortlhe out-flowing ground product or pulp. I

If the apparatus is used for grindingores then the pipe 26 may bearranged-to deliver the product or pulp intol a mercury web 1 so yas toamalgamate the metallic particles, Vcontained therein.

vIn `the operation of the `machine themal terial to be ground if in theform of a pulp may be introduced either' along with the grindingmaterial through the hopper 16,

through hopper 16 and the pulp introduced through Itheaperture 18'. Itthe material to be ground is introduced in the form of pieces 0f a sizesuitable te pass through the' opening 15 'then the Water, orother liquidlois or said grinding material may be introduced canbeintroducedeitherwith the through the hopper 16 or through the ap! erture18 as preferred.. The elliptical coni uration of the barrel or shell linsures .e cient grinding or reduction of thel mate- ;6 rial -until thenely ground product, con `veyed by the liquid co-mponent o'f the charge,enters the box or launder 27 andA '-16 end, as set forth.

2. A' rotary grinding machine comprising a. barrel or shellof ellipticalshape in cross- 1 section, the major axis of the ellipse at one endbeing at right angles t-o the major axis 20 of the ellipse at the otherend and tapered from end to end.

' 3. A rotary grinding machine comprising a' barrel or shell, end coverstherefor, means for supporting said barrel or shell, means for rotatingythe same, ineans -for introducing the material into the barrel or.shell, the

barrel or shell being of elliptical shape in cross-section from endV toend, the major axis' of the larger ellipse representing the receiving-end of the barrel or shell being at right angles to the major axis ofthe smaller ellipse representing the delivery end of thebarrel or shell,and means for withdrawing the ground product from the delivery end ofthe barrel or shell.

4. A rotary grinding machine comprising a barrel or shell, end coverstherefor, means'for supporting said barrel or shell, means for rotatingthe, saine, means for introducing the material into the barrel or 40'shell, the barrel or shell being of elliptical shape in cross-sectionfrom end to end, the major axis of the larger ellipse representing thereceiving end of the barrel or shell being at right angles to themajoraxis of the smaller ellipse representing the' delivery end of the barrelor shell, and a pipe for withdrawing the ground product, said pipeprojecting through the delivery end of the shell or barrel and beingcarried up to av 50 suitable height and fitted With a box or launder, asset forth.

In testimony whereof I have signed myname to this specification in thepresence of two subscribing Witnesses.

WILLIAM GOWAN.

itnesses CI-IAS. OVENDALE, MAUD Porn.

